Development of High-Precision Automatic Screw Distribution Device for Saving Energy and Reducing Installation Space

Abstract

To improve the accuracy of the screw distribution process, which precedes the screw-fastening process, and reduce the defect rate, the screw distribution device must be automated. In this study, an existing imported automatic screw dispensing device was analyzed. Air pressure consumption could be reduced by ~67% by applying design technology that decreases the number of divisions. Further, because the screw supply uses the principle of free fall by gravity, it is designed to be distributed and supplied as one part. Moreover, the working time is reduced by more than half because 12 screws can be distributed to the fastening device with one screw distribution unit. To alleviate the problem of the magazine unit, the screw is dropped immediately after being seated on the bolt knife. Consequently, the height of the driving part could be reduced by approximately one-third. Finally, static and dynamic analyses were performed to verify the suitability of the design—based on the results of analyses, the design was determined safe because the stress value was within both the yield strength range and elastic range. Furthermore, because the maximum deformation for the load condition was in the elastic section, this design could be verified as safe.